Improvement in mica windows and doors for stoves



2 Sheets-Sheet 1.

W. A. GREENE. Mica Window and Doorfor Stoves.

No. 220,528. Patented Oct. 14,1879.

INVENTUR I I: s Mm 14/ 21% z 4,; M M 54 I 7 4W rW% N-FEIERS.PHDTO-LITHOGRAPHER. WASmNGTON. D 0v 2 Sheets-Sheet 2.

W. A. GREENE. Mica Window and Door for Stoves.

No. 220,528. Patented Oct. 14, 1879.

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" UNITED STATES WILLIAM A. GREENE, OF ELIZABETHPORT, ASSIGNOR OFTWO-THIRDS OF Futon HIS-RIGHT TO EDWIN R. OAHOONE AND ANDREWT ALBRIGHT,OF NEVV- ARK, NEW JERSEY.

IMPROVEMENT IN MICA WINDOWS AND DOORS FOR STOVES.-

Specification forming part of Letters Patent No. 220,528, dated October14, 1879; application filed August 37, 1879.

' bituminous coal or other fuel generating smoke.

This I accomplish partly by the construction of the windows and doorsthemselves, and partly by the formation of the stove and the an-angementofthe windows or doors therein.

In the drawings, Figure 1 is a vertical midsection of a stove embodyingmy invention.

Fig. 2 is a horizontal action of the same, taken in the plane of theline 117 0:. Figs. 3 and 4 are vertical cross-sections of a window anddoor ona larger scale, and Fig.6 is a rear elevation of the door shownin Fig. 4. Fig. 6 is a side elevation of the stove, showing a modifiedposition of the window; and Fig. 7 is a rear elevation, showing the samepartly in section, taken in the plane of the line y y.-

Let A A represent the walls of the stove, and B the fire-box orcombustion-chamber thereof. In the construction shown the chamber B ispartially diyided into two parts by a transverse partition, 0, and theforward part is provided with a roof, at, extending from the top of thepartition 0 to the front of the stove. The combustion in this fire-boxis supported by air admitted at the several points I) b, or at othereffective places, and the fuel will ordinarilyoccupy the space indicatedby the dotted lines. The back wall of this fire-box orcombustion-chamber is curved in a'uniform sweep upward and forward toapoint sufficiently above the partition 0 to leave room for the passageof the gases from the chamber, whereby the gases are directed toward thefrontof the stove, over the roof-plate a. The direction of the stream ofgases is thus entirely changed, it

A gaschamber, D, is arranged above the combustion-chamber B, to receivethe gases as they leave that chamber and conduct them to the fluesEE,which, in the construction shown, are arranged at the sides of thestove, and

from which the gases are conducted to the stove-pipe.

The exact construction and operation of the before-mentioned parts andof the parts not referred to in this specification are fully set forthin my application for a patent on improvements in parlor stoves orheaters, filed July 24, 1879.

F is an illuminating window set in the curved back wall of thecombustion-chamber B, where the incandescent fuel in the chamber isplainly visible, and Where the brightlyburning gases afford a brilliantillumination.

G is an illuminating-door situated at the front of the gas-chamber D,where the luminous gases coming from the chamber B are also visible.This door may be arranged-in the front wall of the stove, or it may beset back a short distance, forming a recess, as shown.

The construction of the window Fand door G is shown in Figs. 3, 4, and5, where cis the outer frame of the window or door; d, the mica, and ethe inner frame or mat. The outer frame is of the usual construction,with the exception of its lowerside, where aslitor continuous opening,f,is provided, admitting air under the bottom edge of the mica pane. Theinner frame or mat is formed of two horizontal bars, 9 9, one at or nearthe top and the other at the bottom, and of a series of vertical bars, hh,

corresponding to the vertical bars of the outer frame, 0. Of the innerframe the bars h h are alone in contact with the mica, the bars 9 gstanding off from it a short distance, sufficiently to permit the freepassage of a current of air between them and the mica. The mica panesare thus clamped between the bars g g of the inner frame and thecorresponding bars of the outer frame, and are held only at their edges.

A current of cool air from outside the stove enters at the openingf, andpasses up in a thin sheet or film along the inside surface of the micauntil it reaches the top of the latter, when it mingles with theproducts of combos tion in the stove and passes into the fines. Thissheet of cool air protects the mica from contact of the smoke or heatedgases from the fuel, and thereby keeps it clean and transparout for amuch longer time than has been heretofore possible. This constructionwill produce the best results only when the win dow or door is arrangedin the stove substantially as shown in the drawings.

As will be seen by reference to Fig. 1, the products of combustion fromthe fire-box are caused to sweep around a curve before they leave thesame, and in doing so are thrown by centrifugal force against the curvedback wall, and are pressed against the window F, which is set in thatwall,

As the gases leave the chamber B and enter the gas-chamber D they aredirected toward the front of the stove, and impinge directly upon thedoor G before passing to the fines.

It will be seen that by this construction both the window F and door Greceive the pressure of a stream of gases, which are forced against themby the draft, instead of being drawn away from them, as is the caseinmost stoves. The sheet of cool air passing up the inside face of themica is thus pressed firmly against the latter, and prevented fromleaving the same until it has passed across its entire length, whereasif the gases from the fuel were drawn away by the draft the sheet ofcool air would not adhere to the mica, but would pass ofi' from itbefore reaching its top, and leave it exposed to contact of eddyingcurrents of smoke, so that its upper portion at least would becometarnished.

I am aware that it is not new to keep a mica window clean by passing acurrent of air across its inner surface, and I make no claim to thisfeature, except in connection with a stove of such form that the gasesare caused to press the air-current against the mica, or when used withmy improved construction of frames.

The illuminating windows or doors may be somewhat difl'ereutly arrangedin the stove without departing materially from my invention, andadditional windows or doors may be provided, if desired; but they shouldbe arranged in some part of the stove where the current of gases willpress against them, as before described. With the construction shownthisetfect might he secured by locating a win dow in the side wall,where the gases from the chamber D will impinge upon it as they enterthe flue E. A window thus arranged is clearly shown at H in Figs. 6 andI.

Theilluminatin g doors or windows constructed according to my inventionmay have one or more panes of mica, as may be preferred, and if theupper horizontal bar, 9, of theinncrframe, e, is set high enough up andis sufiiciently thin, it may be arranged in contact with the mica, sothat the air-current will pass inside of it instead of between it andthe mica; but I prefer the construction shown.

I claim as my invention- 1. In a stove, a mica window or door providedwith a slit or opening, 1, in its lower side for the admission of astream of outer air under the bottom edge of the mica, and arranged at apoint in the walls where the gaseous products of combustion willhugorimpiuge against it in their passage from the fire-box to the flue,substantially as and for the purposes set forth.

2. The mica window F, arranged in the curved back wall of thecombustion-chamber B, where the burning gases are thrown against itcentrifugally in their passage to the flue or flues, provided with aslit or opening, f, in its lower side, whereby a stream of outer air isadmitted under the bottom edge of the mica and permitted to pass upwithout obstruction along its inner face, substantially as and for thepurposes set forth.

The illuminating-doorG, arranged at the front of the chamber D, wherethe burning gases from the combustion-chamber B are di rected against itas they leave that chamber, provided with a mica pane or panes, andconstructed with an opening or slit, f, in its lower side for theadmission of a stream of outer air beneath the bottom edge of the mica,substantially as set forth.

4. An illuminating door or window consisting of an outer frame, 0, apane or panes of mica, d, and an inner frame or mat, e, the lattercomposed of vertical bars h h, between which and the frame a the mica isclamped, and horizontal bars g g, the lower of which is arranged tostand off from the mica out of contact therewith, and the two arrangedto leave an air-inlet opening, f, under the bottom edge of the mica,substantially as set forth.

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

WILLIAM A. GREENE. \Vitnesses E. R. CAHOONE, ARTHUR U. FRASER.

